柴油气-液-固催化氧化脱硫研究

从七种金属无机盐和氧化物中筛选出较优的柴油氧化脱硫催化剂,通过采用纯氧和优选催化剂及不同萃取剂对柴油进行气-液-固三相催化氧化脱硫研究。实验表明,选用Al2O3作氧化催化剂,以含水糠醛溶液作脱硫萃取剂,在搅拌速度700r/min、催化剂用量5%(W)、反应温度140℃、氧化时间90min和充氧压力0.6MPa的操作条件下,对直馏柴油进行催化氧化脱硫,其硫含量由1441μg/g降到262μg/g,脱硫率达到81.8%。     

Idaho Rapidcycler PCR仪上用薄壁管进行RAPD扩增的程序优化

以地桉ＤＮＡ为材料,对Idaho Rapidcycler扩增仪上用薄壁管进行ＲＡＰＤ扩增的程序进行了优化研究,通过逐步对退火、延伸和变性的温度和时间及总的循环次数设置不同梯度和亚梯度,比较不同梯度和亚梯度的扩增结果,确定优化程序为：９３℃预变性１min;再４０次循环：９３℃变性２０s,38℃退火２１s, 7２℃延伸７min。该程序的扩增时间较短,具有较好的特异性和重复性。另外,薄壁管反应架在反应室的内位比同时扩增的外位效果差,扩增时只能利用外位。     

2,3,7—三羟基—9—（3,4—亚甲二氧苯甲基）—6—荧光酮？…

本研究了在阳离子表面活性剂溴化十六烷基三甲铵（ＣＴＭＡＢ）存在下,锆（Ⅳ）与２,３,７－羟基－９－（３,４,－亚甲基）－６－荧光酮（简称胡椒基荧光酮,９－ＰＦ）的显色反应。在０．１－～０．１５ｍｏｌ．Ｌ＾－１。ｃｍ＾－１,Ｚｒ（Ⅳ）在０～９ｕｇ／１０ｍｌ范围内符合比尔定律,采用石油醚萃取分离铁,能显提高分析方法的选择性。采用拟定方法测定了钢铁样品中的微量Ｚｒ（Ⅳ）,结果满意。     

TNF基因治疗肿瘤的研究进展

肿瘤坏死因子 (TNF)是一种既能直接杀死肿瘤细胞 ,又能通过激活免疫系统发挥抗肿瘤作用的细胞因子 .其基因工程药品临床应用后 ,具有严重的毒副作用 ,因此 ,人们开始了TNF基因冶疗的研究 .TNF基因治疗为TNF在肿瘤治疗中的应用开拓了新的途径     

Formation of domain structure of erythrocyte membrane in Wistar rat fed with CeCl3 per os

To explore the possibility of absorption of lanthanides via digestive duct and their effects on the membrane structure and permeability of erythrocytes, the fine structure of erythrocyte membrane from Wistar rats, fed for 70 days of daily administrationper os with 20 mg CeCl₃/kg weight, was imaged by means of atomic force microscopy and FT-IR deconvolution spectra. The results show that, although the erythrocytes maintain the intact shape, the change of secondary structure, aggregation and crosslinking of the protein particles of membrane surface and the enlarged lipid regions lead to the domain structure formation. This structure might be responsible for the increasing permeability of erythrocyte membrane.     

Responses of plant rhizosphere to atmospheric CO2 enrichment

Plant root growth is generally stimulated under elevated CO₂. This will bring more carbon to the below-ground through root death and exudate. This potential increase in below-ground carbon sink may lead to changes in long-term soil sequestration and relationship between host plants and symbions. On the other hand, changes in litter components due to the changes in plant chemical composition may also affect soil processes, such as litter decomposition, soil organic matter sequestration and hetero-nutritional bacteria activities. These issues are discussed.     

反相高效液相色谱法快速鉴别雷公藤生药和浸膏

利用反相高效液相色谱法对雷公藤甲素进行了鉴别,色谱条件C18柱(250mm×4.6mm,5μm),检测波长218nm,流动相分别为甲醇水—60∶40(V/V)和甲醇水—5050(V/V);通过实验建立了一种简便、快速、准确、鉴定出雷公藤甲素的方法,为生药真伪的快速鉴别及药品的质量监测提供理论依据.     

带有并联电阻的双调谐滤波器参数特性分析

高压直流输电系统中,双调谐滤波器使用广泛。将电阻并联在双调谐滤波器上可使双调谐滤波器获得较好的高通滤波的性能,并减小滤波器之间及与系统之间发生谐振的可能性,但同时加大两个串联谐振附近的阻抗,也增加了整个滤波器的谐波有功损耗。通过分析双调谐滤波器和带有并联电阻的双调谐滤波器的元件参数特新,比较两种滤波器的元件参数对谐振频率灵敏度影响,确定了带有并联电阻的双调谐滤波器元件参数变化对系统影响明显优于普通双调谐滤波器。     

One-pot synthesis and optical properties of In-and Sn-doped ZnO nanoparticles

Colloidal indium-doped zinc oxide (IZO) and tin-doped zinc oxide (ZTO) nanoparticles were successfully prepared in organic solution,with metal acetylacetonate as the precursor and oleylamine as the solvent.The crystal and optical properties were characterized by X-ray diffraction,UV-visible spectrophotometry,and fluorescence spectroscopy,respectively;the surface and structure morphologies were observed by scanning electron microscopy and transmission electron microscopy.The XRD patterns of the IZO and ZTO nanoparticles all exhibited similar diffraction peaks consistent with the standard XRD pattern of ZnO,although the diffraction peaks of the IZO and ZTO nanoparticles were slightly shifted with increasing dopant concentration.With increasing dopant concentration,the fluorescent emission peaks of the IZO nanoparticles exhibited an obvious red shift because of the difference in atomic radii of indium and zinc,whereas those of the ZTO nanoparticles exhibited almost no shift because of the similarity in atomic radii of tin and zinc.Furthermore,the sizes of the IZO and ZTO nanoparticles distributed in the ranges 20-40 and 20-25 nm,respectively,which is attributed to the difference in ionic radii of indium and tin.     

新型生物菌肥对日光温室草莓产量影响及其数学函数模型的建立

通过二次正交旋转回归设计,探讨不同种生物菌肥对草莓的产量的影响.以这4种菌肥为决策变量,以草莓产量为目标函数,通过在乌兰察布地区日光温室作物草莓的试验地进行田间试验获得数据,建立了草莓产量与参数因子间的数学模型,得出了各因素与产量的主次关系和双因素搭配的产量效应.最后,通过计算机模拟寻优获得了在该实验地条件下的最高产量.草莓最高产量36861.54kg/667 m2的施肥方案：A（EM液体喷施）、B（绿康微液体喷施）、C（A50液体喷施）、D（A50粉末土壤施用）分别为：1.96 ～ 2.04g/L、1.927 ～ 2.073 g/L、0.71 ～0.790 g/L、1.3940 ～ 1.606 kg/667 m2.